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8

Transient studies of

FACTS and Custom Power

equipment

8.1 Introduction

Electromagnetic transient studies have always played an essential role in the analysis
of electrical power systems. They provide priceless information relating to the behav-
iour of the system in the event of different forms of transient phenomena, which can
hardly be achieved by other means. This chapter addresses the transient studies of
electrical networks with embedded, power electronics-based, FACTS and Custom
Power (CP) controllers. The FACTS controllers considered here are:

. SVC
. TCSC
. STATCOM.
The CPcontrollers include:
. D-STATCOM
. DVR
. PFC
. Shunt-Connected VSC-based AF
. Solid-State Transfer Switch (SSTS).
The transient analysis and modelling is performed with the state-of-the-art digital
simulator PSCAD/EMTDC v2.00 (Manitoba, 1996) for UNIX, unless otherwise
stated. The appendix at the end of this chapter presents the settings of the most
relevant blocks used in the digital implementations developed in PSCAD/EMTDC,
for each of the FACTS and CPcontrollers considered here.